The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 2010
Filed:
Feb. 04, 2008
Kenji Sato, Matsumoto, JP;
Kenji Sato, Matsumoto, JP;
Epson Toyocom Corporation, , JP;
Abstract
A mobile navigation system gyro module comprises: first and second gyro sensors outputting angular velocities ω, ωaround first and second axes intersecting at an acute angle θ; a sign determination circuit determining a sign of ω; a correction circuit correcting the first and second gyro sensor outputs; and a computation circuit computing ω'=√(ω+SA) and SA=(ω−ω′ cos θ)/sin θusing angular velocities ω′, ωfrom the correction circuit, and outputting angular velocity ω by multiplying ω′ by the sign of ω, wherein the correction circuit includes: first and second offset adjustment circuits outputting ω″ and ω″ by respectively subtracting from ωand ω, corrections Band Bcorresponding to the first and second gyro sensor outputs when the mobile unit stops; and the angular velocity ω is around an axis coplanar with and between the first and second axes.